Electric alarm device



(No Model.)

L. PITZ GERALD 8v J. FAY. ELECTRIC ALARM DEVIGE.

No. 595,096. Patented 1390.7,1897.

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llirnn STATES PATENT OFFICE.

LOUIE FITZ GERALD, OF HARTFORD, AND JOSEPH FAY, OF YALESVILLF CONNECTICUT.

ELECTRIC ALARM DEVICE.

SPECIFICATION forming part of Letters Patent No. 595,096, dated December 7', 1897. Application filed February 12,1897- Serial No. 623,074. (No model.)

To all whont it may concern:

Be it known that we, LOUIE FITZ GERALD, residing at Hartford, in the county of Hartford, and JOSEPH FAY, residing at Yalesville, in the county of New Haven, State of 0011- necticut,citizens of the United States, have invented certain new and useful Improvements in Electric Alarm Devices, of which the following is a full and complete specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to electric alarm devices for use in a building or a compartment thereof for sounding an alarm in case of fire or when the temperature reaches a predetermined point; and the object of the invention is to provide an improved device of this class in which we employ an electric alarm and a thermometer, the construction and arrangement of the parts being such that the alarm will be operated when the thermometer indicates a predetermined degree of heat.

In the practice of our improvement we provide an oblong box or casing, in which the principal part of the operating mechanism is located, and said box or casing is provided with a hinged door.

In the drawings forming part of this specification, Figure 1 is a front view of our improved alarm device, a part of the door being broken away to better show the interior mechanism; Fig. 2, a side view thereof, the box or casing being shown in vertical section; Fig. 3, an end view of a detail of the construction, and Fig. at a back view thereof.

In the drawings forming part of this specification the separate parts of our improvement are designated by the same numerals of reference throughout the several views, and in said drawings the box or casing which we employ is designated by the reference-numeral 5, and in practice we secure in the upper end of said box or casing and to the back thereof a plate 6, which is provided with an upwardly-directed extension 7, which passes through the upper end of the box or casing and on which is mounted a bell or gong 8.

Mounted on the plate, 6 within the box or casin g, is an electromagnet 9,consisting of two coils 10 and 11, and the lower coil 11 is provided at the left-hand end thereof with two shoulders or projections 12, between which is pivoted a spring 13, which is provided with an upwardly-directed arm 14 and with a horizontal arm 16, which rests upon a pin 17, secured to or formed on the plate 6.

Secured to the spring 14 at 18 is an armature 19, which is provided with an arm 20, which projects upwardly through the upper end of the box or casing and which is provided at its upper end with a knob or hammer 21, which is adapted to operate in connection with the bell or gong 8, and adjacent to the outer side of the upper end of the arm 1d of the spring 13 is a shoulder or projection 22, which is secured to or formed on the plate 6 and through which passes a screw 23, the inner end of which is adapted to operate in connection with the arm 14 of the spring 18, and connected with said screw is a wire or conductor 24:, which is connected with the opposite end of the coil 9, and a wire or conductor 25 extends from the corresponding end of the coil 11 downwardly to a binding post or screw 26 and below said binding post or screw 26 downwardly into the box or casing,as shown at 27, and is provided with a backwardly-directed extension 28.

In the bottom of the box or casing is placed a battery, as 29, one pole of which is shown at 30, and said pole is provided with a bindingpost 31, with which is connected a wire or conductor 32, which extends upwardly into the box or casing and is provided with a back- Wardly-directed extension 33, and the extensions 28 and 33 of the wires or conductors 27 and 32 are in the same transverse plane.

Secured to the door 34 of the box or casing and preferably to the lower part and centrally thereof is a thermometer, which 0011- sists of the usual scale-plate 35 and the bulb 36, provided with the upwardly-directed glass tube 37, and the bulb 36 is filled with quicksilver, which is indicated by the heavy dark shading at 38, and extending downwardly from the binding-post 31 is a wire or conductor 39, which passes outwardly through the door at 40 and into the bulb 36, and extending through the upper end of the glass tube 37 is another wire or conductor 41, which pivoted, as shown at 49, an armature 50, the

lower end of which is adapted to operate in connection with the core of the magnet 43, and secured to the angle-plate 45 is a spring 51, the upper end of which bears upon the upper end of said armature and is designed in the normal position of the parts to hold the lower end of said armature out of contact with the core of said magnet.

The frame in which the magnet 43 is mou nted is secured to the left-hand side of the box or casing, and pivoted in the front of said frame is a transverse rod or bar 52, to which is secured an outwardly-directed arm 53, which is provided at its outer end with a transverse plate 54, to the lower opposite corners of which are secured downwardly and inwardly curved spring-arms 55, and connected with the end of the rod or bar 52 is an arm 56, which projects in a direction opposite to that of the arm 53 and which is provided with a cross-head 57, which is adapted to operate in connection with the lower end of the armature 50.

The frame in which the m agnet 43 is mounted is secured to the side of the box or casing by means of arms or plates 58, which are formed on or secured to the plate 44, and connected with the plate 6 in the upper end of the box or casing is a binding-post 59, with which is connected a wire or conductor 60, which extends downwardly and is connected with one pole of the battery, as shown at 61, and extending from said binding-post 59 is another wire or conductor, as 62, which is connected with one end of the magnet 43, and the wire or condnctor41, which is connected with the upper end of the tube 37 of the thermometer, is connected with the opposite end of said magnet.

The armature 19, which is secured to the spring 13, operates in connection with the cores of both coils of the magnet 9, and the operation will be readily understood from the foregoing description when taken in connection with the accompanying drawings and the following statement thereof.

Secured to the plate 54 is a string or cord 63, which passes through the side of the box or casing at 64, and in the normal position of the parts the plate 54 and the arm 53 of the rod or bar 52 are pulled up by means of said strings or cords into the position shown in Fig. 3, and in this position of said parts the cross-head 57 of the arm 56 of said rod or bar 52 will rest under the lower end of the armature 50, and said magnet will be held by the spring 51 in the position shown in Fig. 4.

Suppose that the lower end of the wire 41 in the tube 37 of the thermometer be set at 100. When the mercury or quicksilver rises to said point, the circuit will be closed through the wires 39 and 41 and through the magnet 43, and said magnet will attract the lower end of the armature 50, which will be drawn off of the cross-head 57 of the arm 56 of the rod or bar 52, and the plate 54 will drop into the position shown in Fig. 1, in which position the spring-arms will strike or rest upon the inwardly-directed extensions 28 and 33 of the wires or conductors 27 and 32, and the circuit will also be completed through said wires to the magnet 9, and the magnet 9 will actuate the armature 19, and said armature will operate the gong or hell, and thus sound the alarm.

The set-screw 23 is intended to be set in such position as to hold the arm 14 of the spring 13 in proper operative position, and the extension 16 of said spring also aids in the operation of said spring-arm.

It will be understood that a suitable circuit making and breaking device may be provided by means of which the operation of the alarm may be stopped, if necessary, before the temperature in the building or compartment is lowered, but such device forms no part of this invention and is therefore not shown and described, and in order to again set the device all that is necessary is to pull outwardly on the string or cord 63, and thus raise the plate 54 and the arm 53 and lower the arm 56, so that the cross-head 57 thereof will again gage with the lower end of the armature 50.

The magnet 42 and the operative parts connected therewith, including the rod or bar 52, the arms 53 and 56, connected therewith, the devices connected with the arm 53, and the magnet 50, constitute the operating devices for closing the circuit and sounding the alarm,

and our improvement is well adapted to accom plish the result for which it is intended, and is also comparatively inexpensive, and, if desired, it may be inclosed in a fireproof casing; and it will be apparent that changes in and modifications of the constructionherein described may be made without departing from the spirit of our invention or sacrificing its advantages.

Having fully described our invention, we claim as new and desire to secure by Letters Patent v 1. In an electrical alarm device, a circuitclosing apparatus, consisting of an electromagnet 43 mounted in a casing which consists of an end plate 44, angle-plate 45 connected by transverse bars or bolts 46, said plate 45 being provided with an extension 47 having jaws 48, an armature 5O pivotally connected therewith, the lower end of which is adapted to operate in connection with the core of the said magnet, a spring 51 secured to said plate 45, the upper end of which bears against the said armature and adapted to hold the same out of contact, a transverse rod or bar 52, secured to the casing in which the said magnet is mounted, and provided with an arm 53 to which is secured aplate 54 having springarms 55, an arm 56 securedto the end of said rod or bar 52 and which projects in a direction opposite to that of the arm 53 and provided with a cross-head 57 adapted to operate in connection with the lower end of the armature 50, said magnet being connected with a suitable battery and when the said armature is actuated by the said magnet, the said plate 53 is adapted to fall by gravity and close the circuit through the conductors 32 and 37, substantially as and for the purpose set forth.

2. The herein-described electric alarm device comprising an electrical alarm-bell, a thermometer adapted to close the circuit when the mercury reaches a predetermined point, and a circuit-closing device consisting of an electromagnet 43 mounted in a casing which consists of an end plate 44, angle-plate 45 connected by transverse bars or bolts 46, said plate 45 being provided with an extension 47 having jaws 48, an armature 50 pivotally connected therewith, the lower end of which is adapted to operate in connection with the core of the said magnet, a spring 51 secured to said plate 45, the upper end of which bears against the said armature and adapted to hold the same out of contact, a transverse rod or bar 52, secured to the casing in which the-said magnet is mounted, and provided with an arm 53 to which is secured a plate 54 having spring-arms 55, an arm 56 secured to the end of said rod or bar 52 and which projects in a direction opposite to that of the arm 53 and provided with a cross-head 57 adapted to operate in connection with the lower end of the armature 50, said magnet being connected with a suitable battery and when the said armature is actuated by the said magnet, the said plate 53 is adapted to fall by gravity and close the circuit through the conductors 32 and 37, substantially as and for the purpose set forth.

In testimony that we claim the foregoing as our invention we have signed our names, in the presence of the subscribing witnesses, this 8th day of February, 1897.

LOUIE FITZ GERALD. JOSEPH FAY. WVitnesses:

MARIoN B. BROWNE, J. LINCOLN FENN. 

